BWR-04J(TH) Transformer Winding Temperature Indicator

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BWR-04J(TH) Transformer Winding Temperature Indicator

Product ID：CLWDwdj001

Price: Please inquire PDF Format

Supply Ability:100 SETS/MON

Port:SHENZHEN

Product Introduction
Other information

Model NumberBWR-04J (TH)

Brand NameHENGREN

Payment TermsTT，PAYPAL，Alibaba.com Pay

BWR-04J(TH) Transformer Winding Temperature Indicator
Product Overview
The BWR-04J(TH) Transformer Winding Temperature Indicator is a specialized temperature monitoring instrument designed for power transformers. Based on the additional temperature rise principle, it accurately indicates the hottest winding temperature by combining transformer top-oil temperature and load-related winding temperature rise.
The instrument features a compact structure, comprehensive functions, easy installation, and simple operation. It provides a standard DC 4–20mA output signal for integration with SCADA systems, PLCs, DCS platforms, and secondary instruments, making it ideal for unattended substations and intelligent power distribution systems.
The BWR-04J(TH) consists of an elastic element, sensing capillary, temperature bulb, heating element, integrated transmitter, and digital display unit, ensuring reliable and continuous transformer thermal monitoring.

Key Features
• Designed specifically for transformer winding temperature measurement
• Simulates winding hot-spot temperature accurately
• Standard DC 4–20mA output for remote monitoring
• Digital temperature display for easy reading
• Four fully adjustable alarm and control contacts
• Compact design and simple installation
• Suitable for unattended substations and smart grid systems
• Reliable operation under harsh environmental conditions
• High measurement accuracy and long-term stability
• Compatible with SCADA, PLC, DCS, and monitoring systems

Working Principle
The temperature bulb is installed in the top oil pocket of the transformer tank and continuously measures the top-layer oil temperature.
When the transformer operates without load, the instrument indicates the actual oil temperature. As transformer load increases, a current proportional to the load is obtained from the transformer current transformer (CT). After adjustment by the integrated transmitter, this current flows through an internal heating element located inside the bellows assembly.
The generated heat simulates the temperature rise of the transformer winding above the oil temperature. The displacement of the elastic sensing element therefore reflects both:
• Transformer top-oil temperature
• Winding temperature rise caused by load current
As a result, the displayed value represents the sum of the oil temperature and winding-to-oil temperature rise, providing an accurate indication of the transformer's hottest winding point temperature.

Technical Specifications

Parameter	Specification
Model	BWR-04J(TH)
Product Type	Transformer Winding Temperature Indicator
Measurement Range	0 ~ 150°C
Accuracy Class	Class 2.0
Maximum Permissible Error	±3°C
Output Signal	DC 4–20mA Standard Current Signal
Operating Temperature	-40°C ~ +55°C
Relative Humidity	≤95%
Alarm Contacts	4 Adjustable Switch Contacts
Contact Setting Range	Adjustable Across Full Scale
Switching Error	±2°C
Differential (Hysteresis)	6 ± 2°C
Contact Rating	AC 250V / 5A
Temperature Bulb Size	Φ14 × 105 mm
Mounting Thread	M27 × 2 mm
Capillary Length	5 m
Protection Rating	IP55
Display Type	Digital Display
Communication Signal	4–20mA Analog Output

Typical Applications
Power Transformers
• Winding hot-spot temperature monitoring
• Transformer thermal protection
• Overload monitoring
Power Substations
• Unattended substation monitoring systems
• Remote transformer temperature supervision
Power Generation Plants
• Generator step-up transformers
• Auxiliary transformers
• Distribution transformers
Industrial Power Systems
• Transformer condition monitoring
• Electrical equipment protection systems
• Smart power distribution networks
SCADA & Automation Systems
• PLC integration
• DCS control systems
• Centralized monitoring platforms

Comparison with Conventional Transformer Temperature Gauges

Feature	BWR-04J(TH) Winding Temperature Indicator	Conventional Oil Temperature Gauge
Measures Winding Hot-Spot Temperature	Yes	No
Measures Top-Oil Temperature	Yes	Yes
Simulates Load Temperature Rise	Yes	No
4–20mA Output	Standard	Usually Not Available
Remote Monitoring Capability	Yes	Limited
Adjustable Alarm Contacts	4 Sets	Typically 1–2 Sets
SCADA/PLC Integration	Excellent	Limited
Transformer Protection Function	Advanced	Basic
Unattended Operation Support	Yes	Limited

FAQ
1. What does the BWR-04J(TH) measure?
The instrument measures the transformer winding hot-spot temperature by combining top-oil temperature with a simulated winding temperature rise generated according to transformer load current.
2. Why is winding temperature more important than oil temperature?
Winding temperature reflects the hottest operating point inside the transformer and is a critical parameter for insulation life assessment, overload protection, and transformer reliability.
3. Does the instrument provide remote monitoring capability?
Yes. The built-in transmitter outputs a standard DC 4–20mA signal that can be connected to SCADA, PLC, DCS, or other monitoring systems.
4. How many alarm contacts are available?
The BWR-04J(TH) includes four independently adjustable switch contacts that can be configured for alarm, cooling control, trip, or other protection functions.
5. Can the alarm setpoints be adjusted?
Yes. Each contact can be freely adjusted across the entire measurement range.
6. Is the instrument suitable for outdoor transformer installations?
Yes. With an IP55 protection rating and operating temperature range of -40°C to +55°C, it is suitable for demanding outdoor environments.

Why Choose BWR-04J(TH)?
The BWR-04J(TH) Transformer Winding Temperature Indicator provides accurate hot-spot temperature monitoring, dependable alarm protection, and seamless integration with modern automation systems. Combining oil temperature sensing, load-based winding temperature simulation, four programmable alarm contacts, and a standard 4–20mA output, it is an ideal solution for transformer thermal protection, condition monitoring, and intelligent substation management.

FAQ
1. What does the BWR-04J(TH) measure?
The instrument measures the transformer winding hot-spot temperature by combining top-oil temperature with a simulated winding temperature rise generated according to transformer load current.
2. Why is winding temperature more important than oil temperature?
Winding temperature reflects the hottest operating point inside the transformer and is a critical parameter for insulation life assessment, overload protection, and transformer reliability.
3. Does the instrument provide remote monitoring capability?
Yes. The built-in transmitter outputs a standard DC 4–20mA signal that can be connected to SCADA, PLC, DCS, or other monitoring systems.
4. How many alarm contacts are available?
The BWR-04J(TH) includes four independently adjustable switch contacts that can be configured for alarm, cooling control, trip, or other protection functions.
5. Can the alarm setpoints be adjusted?
Yes. Each contact can be freely adjusted across the entire measurement range.
6. Is the instrument suitable for outdoor transformer installations?
Yes. With an IP55 protection rating and operating temperature range of -40°C to +55°C, it is suitable for demanding outdoor environments.